GCC for Windows 64 & 32 bits

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Mingw-w64 brings free software toolchains to Windows. It hosts a vibrant community which builds and debugs software for Windows while providing development environment for everyone to use.

It has forked mingw.org in order to move forward and provide 64bit support and support for new APIs and has brought countless improvements since its creation in 2007.

Version 4.0 has been released

  • 32bit ARM thumb software math (Thanks to André Hentschel!).
  • New ftw() support for gcc-5.x support.
  • Experimental printf changes - Ability to print 128bit integers (%I128*) and Decimal Floats (%H, %D), disabled by default. Build the CRT with —-enable-experimental to use.
  • Updated OpenGL 4.5 headers.
  • Better DirectX 11 support.
  • Better Windows 7, 8/8.1 API support.

Headers, Libraries and Runtime

  • More than a million lines of headers are provided, not counting generated ones, and regularly expanded to track new Windows APIs.
  • Everything needed for linking and running your code on Windows
  • Winpthreads, a pthreads library for C++11 threading support and simple integration with existing project
  • Winstorecompat, a work-in-progress convenience library that eases conformance with the Windows Store
  • Better-conforming and faster math support compared to Visual Studio's


  • gendef: generate Visual Studio .def files from .dll files.
  • genidl: generate .idl files from .dll files.
  • widl: compile .idl files.

Previous Versions


  • Required for GCC 4.8.
  • Much improved floating point math performance.
  • Improved MSVC intrinsics performance.
  • Addition of wide variants in C99 printf and scanf.
  • Partial C1X secure CRT support.
  • Partial MS Secure CRT templates for C++.
  • Vastly improved Windows 7 and 8 win32 API support.
  • POSIX-style Large File Support.
  • Winpthread: new library, pthreads implementation for Windows.
  • Winstorecompat: new library for Windows Store compatibility (WIP).


  • Expanded Windows Vista/7 API support.

Most Recent Activity

Martin Storsjö committed [b1de31]

ucrt: Move _snwprintf and fwprintf to separate translation units

Martin Storsjö committed [9077bf]

crt: Regenerate Makefile.in

Martin Storsjö committed [c69c7a]

headers: Update the threadlocinfo struct for ucrt

Martin Storsjö committed [7e9a76]

ucrt: Remove a leftover comment

LH_Mouse committed [04db04]

include/winbase.h: Add new PROC_THREAD_ATTRIBUTE values

G4JC created ticket #95

Add 'SearchAPI.h'

Martin Storsjö committed [f1a55b]

widl: Allow overriding the default include path

Martin Storsjö committed [5a6103]

widl: Regenerate Makefile.in and configure

LH_Mouse committed [4539f4]

include/winioctl.h: Add new device types.

HEMMI, Shigeru posted a comment on discussion Open Discussion

Dear Kai, Thanks for the reply and I agree with what you wrote. Best regards, HEMMI, Shigeru